mentioned this happening in other cities, including new york. >> absolute lit. if all the rooftops in chicago were green, they would say around a million pounds of energy per year. in london, if we look at the scale of things, we're looking at 2 million. >> and we're showing the highlight in new york, this being one example of a rooftop park. one issue it seems is trying to figure out whether to impose this from the top down or let individual companies and businesses come around on their own. do you get the sense there's some momentum or transaction here or would you prefer to see this imposed on them, so to speak? >> oh, i think people have to want it and generally get involved. but sometimes it's about knowing what the benefits are and actually understanding it. i think in terms of cutting energy footprints, that's going to be good and, obviously, something that government is pushing quite hard. so like it or not, i think sooner or later, people will have to get engaged. >> and we just hope it doesn't throw santa off too much when he sees that. thank you very much. >> thank you.